Awxlumv Large Aluminum Heatsink 3.94" x2.71" x 1.41" / 100 x 69 x 36mm Heat Sinks Cooling 27 Fin Radiator for IC Module, PC Computer, Led, PCB

Works great

The fin count and fin aspect ratio of this heatsink is impressive, especially to us old-timers that remember a time when heat sinks with this high a surface-to-volume ratio had to be made by edge-embedding sheet fins into a milled-slot carrier.I found a dimensionally-similar (2.581" wide instead of 2.71", 1.340" tall instead of 1.41" tall) heat sink in an online AAvid catalog, model # 83220. The AAvid heatsink specs were 1.01 oC/W/3in (still air), so I'm expecting this heatsink could be 10% better (lower). Note that if you bought a length other than 3", the thermal resistance does not scale linearly with 1/Length, assuming a centrally located thermal point source. For the 15.75" length I'm using, the improvement is only a 50% reduction in thermal resistance.Also note that the thermal resistance decreases (improves) with moving air. While the documentation I found for the #83220 did not provide thermal resistance versus air flow, I found another AAvid catalog and heatsink #72070 (dimensions 3.008" wide, 1.02" tall, similar fin aspect ratio, 1.4 oC/W/3in) that provided a thermal performance versus airflow table; for a modest airflow (quiet muffin fan) of ~700 LFM, the thermal resistance drops by about another 70%.Net result, for the 15.75 inch length option, operating with 700 LFM forced air flow, is expected to be about (1oC/W/3in * 90% * 50% * 30%) = 0.14oC/W. My heat source is distributed along the 15.75" length, rather than being a point source in the center, so I expect the actual performance to be 2-3x better (lower resistance) than the above calculation.One final note, the fins on these heatsinks are thin and quite prone to bending, especially the outermost vanes. These arrived well-packed in foam sheets inside a custom-sized cardboard boxes, and only one of the four I purchased required any straightening of the fins.

最初は小さなヒートシンクを使っていましたが、ヒートシンクで重要なのは「大きさ」と「重さ」だと聞いたのでこれに変更しました。サイズ違いを4つほど購入し、アンプと外付けSSDケース、外付けHDDケース用に使っています。外付けSSDケースや外付けHDDケースは、このヒートシンクを上に載せておくことで、数℃ほど低くすることができます。アンプは夏場などに長時間使っているとおかしくなるときがありましたが、これのおかげでとりあえず熱暴走は防げるようになりました。価格が少し高い気もしますが、小さくて軽いヒートシンクではほぼ効果がなかったので、まあ買ってよかったと思っています。あと、これは私が勝手に推測しているだけですが、このヒートシンクには類似品があるように思います。写真での見た目やサイズがほぼ同じだったので、某中古売買サイトで購入したのですが、重さと見た目が少し違いました。類似品は側面や底面が汚く（このヒートシンクはとても綺麗です）、重さも少し軽いので、おそらく材質自体も違うのではないかと思います。

I have a 12 Volt 10 amp heavy duty power supply to replace all individual power supply's that feed part of my network setting and a 4" computer fan to keep it cool and prolong it's life but the noise was quite annoying and had to replace it often.Decided to add a big aluminum radiator adhered with thermal tape to the power supply aluminum rear back plane as to have only convection cooling and yesss it worked absolutely great, now the power supply is barely warm and zero noise.Besides the problems I had with the thermal double side tape lack of enough adherence, which was unable to hold the radiator on it's place and force me to fabricate 4 steel holding brackets , once I installed the brackets now I am absolutely relieved of any overheat problems !!!!

This block of aluminum is definitely made out of aluminum, and it's a block! It has all the benefits of aluminum and can cool things with its block shape!